Glass-drawing process.



1 A. E. SPINASSE; GLASS DRAWING PROCESS.

APPLICATION FILED OUT. 22, 1908.

Patented Mar. 23, 1909.

cm ga vwewbo z sra'r a sauna cannon ARTHUR E. SPINASSE, F MOUNT VERNON,OHIO, ASSIGNOR 01 ON E-l ()lJRTll TO HERBERT W001), OF MQUNT VERNON,OHIO.

no. amass.

pocifleation of Letters Patent.

Patented March 23, 1909.

Application filed Qotober 22, 1908. Serial No. 58,961.

a citizen of the United States, residing at Mount Vernon, county ofKnox. and State of Oh o, have invented certain new and usefulImprovements in Glass-Drawing Processes, of which I declare thefollowing to be a full,

' clear, and exact description.

This invention relates to improvements in drawin hollow glass articlesor cylinders from t a mass of molten glass, and has among its objects toprovide an improved method or process therefor which will re duce to aminimum the difliiculties connected s with the use of baits for suchdrawing operation, and the troubles ex erienced in raising the desiredcylinder of g ass.

a This process or method is illustrated in dis;

\ grammatic Figures 1, 2, and 3 of the draw.-

lngs attached hereto and forming part of this specification.

The form of bait shown and described herein in connection with thisimproved method is likewise shown and described in a copendiin,application of the same applicant, Serial No. 458,858, filed on October21, 1908.

' Said bait itself forms the subject of claims in said otherapplication, while in the present patent it is desired to claimthe-improved method or process referred to.

This method consists of the following steps :First, the hollow bait 10(Fig. 1) is low cred so that its lower periphery or edge just comes incontact with the surface of the 11101- ten glass 11 which may becontained as usual in any desired form ol'rece )tacle. This bait is inthe form of a tubular chain'iber, the diameter of which decreases towardits lower end as plainly shown in the drawings. The lower edge 12-of thebait, where the bait comes in contact with the surface of the glass, isthinned down to be of less thickness than the upper portionof thawallsof tho bait. A tube or ipe 13 leads into the interior chamber of thebait, and by meansofa tube 14 attached thereto, the fluid or gaseouspressure Within the interior chamber of the )ait may be diminished orincreased at will, said tube 14 being attached to suitablewells knownapparatus for that purpose. Having lowered the bait into contact withthe glass, as shown in Fig. 1, the second step of the process consistsin exhausting the air or decreasing the pressure within the bait in suchmanner as to cause a solid column of glass to 'forms. coming within theso rise intothc interior chamber, as shown in Fig.1. Then this conditionof pressure is maintained to hold this column of glass elov'atsd forsufficient duration. to permit slight cooling of the glass and itsadhering to the inner wall of the bait. Then the unbalanced pressure maybe released or the pressure rastorod to initial atmospheric pressure,'or additional pressure may be introduced within the chamber to causethe expelling of the center core oi this glass column downward into themain body of the molten glass. This, however, will result in. leavingslightly cooled portion adhering to the wall of the bait in the shape ofthe ring shown in Fig. 2'. This ring forms the initial portion of theglass cylinder so that the bait may now-be raised for the purpose ofdrawing the remainder of the cylinder as a continuation of thisinitially formed rin 'ln-ordcnhoweven. to. give more body to t e glassat this point,

this improved method may be carried fun.

ther by increasing the pressure within. the bait as the bait is raisedfrom the surface'of the glass, so as thereby to form the lower partofthe said ring into a shouldn 15 engaging the lower-edge of said bait;This will afford. further support for the glass cylinder in thecontinued upward drawing movement of the bait. The further increase ofressure 'within the chamber than permits t e glass cylinder to be blowninto any desired shapc.

, It will be understood that various forms of, baits may be used andvarious forms of gases'may be utilized in connection with producing thevariations of pressure within the interior chamber of the bait and inblowing the glass cylinder, all of these various ope of the claims whichfollow; v

The operator in using this proccss may regulate the pressures by meansof suitable valve'and'gage devices so as to enable him to raise thecolumn of glass to the proper, height and to maintain this columnelevated any. desired duration of time. The thickness of the saidinitial ring'may of course be varied by varying the length of timeduring which ion the column of glass is held elevated. The I columnraised within the bait bcingsornowhat away from the mass of glass willloss some of its plasticity according to the length of time it is soheld thcrc, and moreover by this process the glass is prcvcnted fromcooling too fast. This method also has numer .ghiss by the melting ofthe bait, thus enusual thinnin molten glass, decreasing the fluid ensudxnzitriges over any system in which l to the inner wall oi the bait,and then in ihe lmil' must be inserted within the molten muss, becausesuch bait would then have to be withdrawn quickly for fear of marringthe siding only a thin coating of glass to be atinched to the bait.Furthermore, the colnmn of plastic glass within the bait does not becomesolid or chilled within the bait, but 5 is easily forced out by theblowing rocess, that is, the increase of pressure. Wlienthe suction isreleased and the center core of the column goes down, this provides anopening for the compressed air to force its way into the interior of thecylinder or hollow article to be drawn. Then when the bait is raised andthe slightly more plastic column of glass is returned downward to themass, the continued pressure will serve to blow the shoulders referredto for the drawing of the cylinder; This prevents, to a certain extent,the

down of the glass wall at this I point as it is blown wider.

What is claimed is as follows:

1i 'ihe'method of drawing hollow glass erticles, consisting of firstlowering a hollow bziit into contact with the surface of the ressurewithin the bait to draw up a solid co umn of glass within the bait,maintaining this (-01- i umn elevated for sufficient duration to pernutslight cooling and adhering of the glass (reusing the internal tiuidpressure on said column to expel the central core thereof and leu-ve aring or glass on said inner wall and extendim upward from the surface ofthe molten g 2. The method of drawing hollow glass cylinders, consistingof first lowering a hollow bait into contact with the surface or" themolten glass, decreasing the iluid )ressure within the bait to draw upat solid co umn of glass within the bait, maintaining tliis'columnelevated for sufficient duration to ]1)(l' i mit slight cooling andadhering of the g ass to the inner wall of the bait, increasing theinternal fluid pressure on said column to expel the central core thereofand leave a ring of glass on said inner wall and extend ing upward fromthe surface of the molten glass, and then raising the bait and furtherincreasing the interio' pressureto form the lower part of said ring intoa should err ing the lower edge of said ba t for the fun-her support ofthe glass cylinder in the continued upward drziwing movement of thebait.

In testimony whereof I ailix my signature in the presence of twowitnesses.

ARIHUR E. SPINASSE.

yre

\Vitnosses:

HERBERT Woon. W. (J. Roemvicm

